A magmatic age and four successive metamorphic events recorded in zircons from a single meta-anorthosite sample in the Central Zone of the Limpopo belt, South Africa

H. Mouri, M. J. Whitehouse, G. Brandl, H. M. Rajesh

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27 Citations (Scopus)

Abstract

I on microprobe U-Th-Pb analyses combined with cathodoluminescence imaging of zircons from a metaanorthosite from the Central Zone of the Limpopo Belt record five distinct events. The most concordant ages of cores of zircon yielded a weighted mean 207Pb/ 206Pb age of 334 ± 463.6 Ma, representing the protolith age. The unzoned overgrowths yielded four discrete groups with weighted mean 207Pb/ 206Pb ages of 3150 ± 15 Ma, 2614 ± 4 Ma, 2488 ± 22 Ma and 2009 ± 28 Ma, representing four possible metamorphic events in the Central Zone. This is the first time that a succession of several metamorphic events has been demonstrated in a single rock-type from the Limpopo Belt.

Original languageEnglish
Pages (from-to)827-830
Number of pages4
JournalJournal of the Geological Society
Volume166
Issue number5
DOIs
Publication statusPublished - Sep 2009

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anorthosite
zircon
cathodoluminescence
protolith
Africa
rock

All Science Journal Classification (ASJC) codes

  • Geology

Cite this

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abstract = "I on microprobe U-Th-Pb analyses combined with cathodoluminescence imaging of zircons from a metaanorthosite from the Central Zone of the Limpopo Belt record five distinct events. The most concordant ages of cores of zircon yielded a weighted mean 207Pb/ 206Pb age of 334 ± 463.6 Ma, representing the protolith age. The unzoned overgrowths yielded four discrete groups with weighted mean 207Pb/ 206Pb ages of 3150 ± 15 Ma, 2614 ± 4 Ma, 2488 ± 22 Ma and 2009 ± 28 Ma, representing four possible metamorphic events in the Central Zone. This is the first time that a succession of several metamorphic events has been demonstrated in a single rock-type from the Limpopo Belt.",
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AU - Whitehouse, M. J.

AU - Brandl, G.

AU - Rajesh, H. M.

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AB - I on microprobe U-Th-Pb analyses combined with cathodoluminescence imaging of zircons from a metaanorthosite from the Central Zone of the Limpopo Belt record five distinct events. The most concordant ages of cores of zircon yielded a weighted mean 207Pb/ 206Pb age of 334 ± 463.6 Ma, representing the protolith age. The unzoned overgrowths yielded four discrete groups with weighted mean 207Pb/ 206Pb ages of 3150 ± 15 Ma, 2614 ± 4 Ma, 2488 ± 22 Ma and 2009 ± 28 Ma, representing four possible metamorphic events in the Central Zone. This is the first time that a succession of several metamorphic events has been demonstrated in a single rock-type from the Limpopo Belt.

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